What I *think* is being communicated here is this: It's not about what the person looks like when they are doing laundry or having sex or angry or giving a speech...it's "What does the person look like when they aren't really doing anything at all..." What is their expression at rest...or if they are listening to someone else speak only or something. I think those composites are meant to be used as a baseline comparison.

Like...I just used this pic in something else the other day and so it is fresh in my mind... I've always thought Blondie was an sx/sp and when I look at the sx/sp composite...perhaps I'm right.

Yep, I think we're saying the same thing /are understanding re baseline, which I tried to flesh out at the end. But yeah, re not doing anything at all.

"...On and on and on and on he strode, far out over the sands, singing wildly to the sea, crying to greet the advent of the life that had cried to him." - James Joyce

What I *think* is being communicated here is this: It's not about what the person looks like when they are doing laundry or having sex or angry or giving a speech...it's "What does the person look like when they aren't really doing anything at all..." What is their expression at rest...or if they are listening to someone else speak only or something. I think those composites are meant to be used as a baseline comparison.

Like...I just used this pic in something else the other day and so it is fresh in my mind... I've always thought Blondie was an sx/sp and when I look at the sx/sp composite...perhaps I'm right.

I think @bold can be very telling, just sayen

To avoid criticism, do nothing, say nothing, be nothing.
~ Elbert Hubbard Music provides one of the clearest examples of a much deeper relation between mathematics and human experience.